Datasheet

SLUU155 – March 2003
14
Full-Featured –48-V Hot Swap Power Manager
3.2.2 Functional Test
Turn on both power supplies.
Insert the jumper card into the P1 connector, observing the proper insertion keying. On the EVM main board,
verify the red LED (D1) is OFF. Verify the voltage readings indicated in Table 4 are obtained at the corresponding
test points.
Table 4. Test Point Voltages (Outputs OFF)
TEST POINT REFERENCE VOLTAGE READING
TP1 TP8/TP15 Approx. 2.13 V
TP14 TP8/TP15 Approx. 0.94 V
TP20 TP22/J4 0 ± 200 mV
J6 TP22/J4 4.70 V min.
J7 TP22/J4 4.93 V min.
Place the ENABLE switch in the ON position. Verify the red LED (D1) remains off. The scope should have
acquired a sweep similar to that shown in Figure 6.
EN (5 V/div.)
IRAMP (2 V/div.)
FLTTIME (5 V/div.)
VOUT – (20 V/div.)
t – Time – 10 ms/div.
Figure 6. Load Ramp-Up Waveforms
The brief fault timing ramp which is shown in Figure 6 may or may not be present, depending on the actual values
of the timing parameters for the particular board being used. If the load voltage ramps to full input potential during
the initial reduced rate ramp period, then fault timing does not initiate.
The DMM can be used to verify that the voltages shown in Table 5 are present at the test points indicated.
Table 5. Test Point Voltages –– Outputs ON
TEST POINT REFERENCE VOLTAGE READING
TP20 TP22/J4 ~ Input Supply Voltage
J6 TP22/J4 < 0.8 V
J7 TP22/J4 250 mV MAX
Either place the ENABLE switch in the OFF position, or remove the jumper card, to remove power from the
VOUT terminals.